Returns article with index num from the xml objected returned from parse_pubmed_baseline_file
num
//for example let fp = "./resources/pubmed22n0001.xml" ; let xml = parse_pubmed_baseline_file(fp) ; let article1 = get_article(xml,0) ; Copy
//for example let fp = "./resources/pubmed22n0001.xml" ; let xml = parse_pubmed_baseline_file(fp) ; let article1 = get_article(xml,0) ;
Returns article with index
num
from the xml objected returned from parse_pubmed_baseline_file